Elihu spencer



Ny PETERS. PHOTULITNOGRAPMER, WASHINGTON, D C.

tnitrd 'States @anni dtyiyiw.

ELIHU SPENCER, OF ELIZABETH, NEW JERSEY.

Latem Pfam No. 1`o0,947, dated March. 15,1870. t

HEATING-ATTACHMENT FOR STEAM-BOILERS.

The Schedule referred to in these Letters Patent and making part of thesame I, ELIHU SPENCER, ci" Elizabeth, county of Union, and State of NewJersey, have invented a new and useful Improvement in Steam-GeneratorFurnaces.

Nature and Objects of the Invention.

My invention relates to. the utilization of the waste heat of thesteam-generator furnaces of manufactories, steainboats, Sto., byapplying the same in a superior' manner to heating air for, warmingpurposes.

The furnace is provided, either alone or in connection with hollowgrate-bars, for the purpose, with airpipes or tubes traversing thereverlnerating or smokechamber and the ash-pit immediately beneath thegrate. Said pipes pass through the arch, from side to side, or from onesideibeneath the boiler'y and up between the boiler and the wall of. thearch through the top, and are adapted to receive and deliverl the airoutside of the furuacein any suitable manner.

Description of thc Drawing.

rlhe accompanying drawing represents a'horizontal steam-generator'furnace provided with my improved air-heating arrangement, inillustrative form.

Figure 1 being a horizontal section in the plaire of the grate.

Figure 2, a vertical longitudinal section on the line z if, g. l.

Figure 3a transverse section ou the line y y, fig. 1.

Figure 4, a transversek section ,ou the line a: zang. 1.

Similar letters'of reference indicate like parts in the several figures.

General Description.

In the drawing- A represents the furnace, and

B, the boilers or generators.

y represents the grate.

b, the bridge.

a, the ash-pit.

s, the smoke-chamber. d, the fire-door, and

d', the ash-pit door of the furnace A.

p p represent the air-heating pipes or' tubes.

gx g represent hollow bars constituting the grate g, and

g2 g, respectively, the supply and hot-air drums connecting said bars.

The manner of applying the pipes p may be varied,

wgrate, as shown, but may be employed in connection with a grate ofother form. The hollow grate, when employed, may be constructed in theusual or other suitable manner. The air to be heated may be taken fromthe room iu which the furnace is located, or eX- ternal air may beconducted to the several pipes and to the grate.

Any usual or suitable means may be employed for purifying, propelling,and conducting the air.

When the apartments to be heated are above the furnace, as will, in mostinstances, be the case,luo propulsion of the air will be necessary', thetendency of the heated air to rise causing it to traverse itsconducting-pipes.

By my invention, without, in the least degree, deletereously affectingthe furnace for its primary use, requiring its enlargement, orincreasing the consumption of fuel, I am enabled to heat, by saidfurnace,the entire establishment in which it is employed, by absorbingotherwise wasted heat and applying it to the air, by apparatus arrangedin otherwise unoccupied space, the apparatus being simple, and adaptedto be readily and cheaply applied. The invention has, therelfore, forits advantage, a nearly net saving of the apparatus, fuel, labor, androom otherwise consumed.

Claims.

I claim as my invention-v 1. The arrangement, in a steam-generatorfurnace, of pipes or tubes p, adapted for the introductiouand dischargeof air, and to absorb and impart to the air in passing through them thewaste heat of the furnace, substantially as represented and described.

2. The combination of the pipes or. tubes p, arranged and employedsubstantially as described, and a hollow or air-heating grate g g g,substantially as set forth. l

ELIHU SPENCER. Witnesses:

JOHN M. CLARK, Jr.,

E. H. GIBBS.

